Companion cells are seen associated with:

Options

A. secondary cambium
B. tracheids
C. idioblasts
D. sieve tubes

Explanation

**Step-by-Step Solution:**

1. **Understanding Companion Cells**: Companion cells are specialized parenchyma cells found in the phloem of angiospermic plants. They play a crucial role in the transport of nutrients.

2. **Identifying the Options**: The question provides four options:
- A) Secondary cambium
- B) Tracheids
- C) Edioblasts
- D) Sieve tubes

3. **Analyzing Each Option**:
- **Secondary Cambium**: This is a type of meristematic tissue involved in secondary growth. It does not have a direct association with companion cells.
- **Tracheids**: These are water-conducting cells found in xylem, not phloem. Therefore, they are not associated with companion cells.
- **Edioblasts**: These are specialized cells involved in the synthesis of certain substances but are not related to companion cells.
- **Sieve Tubes**: These are the primary components of the phloem responsible for the transport of sugars and other metabolic products. Companion cells are closely associated with sieve tubes, providing them with the necessary metabolic support.

4. **Conclusion**: Based on the analysis, companion cells are specifically associated with sieve tubes in the phloem of angiospermic plants.

5. **Final Answer**: Companion cells are seen associated with **sieve tubes**.

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